Weighing scale



C. H. HAPGOGD WEIGHING SCALE oct. 16, 1923. 1 1,470,666

Filed Feb. 18 1920 gij. wwwtoz Patented Oct. 16, 1923.

UNITED STATESv PATENT oFFicE.

CLARENCE H..HAPGOOD, F TOLEDO. OHIO, ASSIGNOR TO TOLEDO SCALE COMPANY, OF TOLEDO. OHIO. A CORPORATION OF NEW JERSEY.

WEIGHING SCALE.

Application led February 18, 1920. Serial No. 359.750.

To all zr/iom if may concern:

Be it known that I. CLARENCE H. HAP-A oooD, a citizen of the vUnited States. residing at Toledo. in the county of Lucas and 6 State of Ohio. have invented certain new and useful Improvements in 'Weighing Scales, of which the following is a specification.

- This invention relates to weighing scales,

and has for its principal object the pro- K' vision of a predetermined weight scale in whichthe load on the scale is counter-bal?.

Figure l is an elevational view of a scale embodying my invention: r

Figure 2 is a vertical sectional view taken adjacent the end of thc beam. parts 0f the scale being shown in elevation:

Figure 3 is an enlarged horizontal section on the line 3-3 of Figure 1. parts being broken away:

Figure i is a further enlarged fragmentary detail perspective showing a balancing ribbon forming an element of my invention; and

Figure 5 is a fragmentaryv elevation showing the connection between the lever and indicating hand.

I have shown my invention as embodied in a scale of the equal-arm or evenbalance type. but it is to be understood that it is capable of embodiment as well in other types of scales. such. for example, as scales having multiplying lever systems.

The frame of the scale shown in the drawings comprises a hase 1 upon which is supporteda substantially fan-shaped housing 2. Mounted in the lower part of the housing is a pair of grooved bearings 3 which rockably receive the fulcrum pivots 4 of the lever 5, the central portion of which is expanded,

as at (L into the form of an annulus to space the fulcrum pivots transversely of the lever; The ends of the lever 5 are forked, as atY 7, and carry load pivots S upon which rest invertedgrooved bearings 9 carried by platform spiders l0. Spider stems l1 depend from theY spiders 10, the lower ends .being connected, as at 12. to check links 13, which are in turn pivoted to the frame on an axis lying directly below the axisof the fulcrum pivots 4.'

For the purpose of damping the vibratory movements of the scale a dash pot containing a fluid of, suitable viscosity is mounted upon the frame and a plunger (not shown) is mounted to reciprocate therein. the plunger being connected to the lever by means of a plunger rod l5.

A graduated beam vi6 carrying a sliding poise 1T is shown as secured to the lever 5.

vThe over and under weightindicator consists of a hand which is adjustably fixed to the lever 5. Vas shown in Figure and. extends upwardly in the housing Q. its upper pointed end swinging over an arcuate chart 19 which is visible through awindow 20 in the upper part of the housing 2.- The zero graduation mark is in the center of the chart,

and when the lever is level the indicator hand points to the zero mark. Either platform 2l may he used as a commodity-ie ceiver. the other platform being used as a poise pan.

In scales of thistype as heretofore constructed various expedients have been resorted to in order to give the lever suicient stability of equilibrium to hold the hand at the zero mark when the scale'is empty or when the loads on the platforms are equal. The most common expedient is that of ositioning` the axis of the fulcrum pivots a ove the center of'mass of the lever. The indicator hand of a scale so constructed will connection as a metallic ribbon 25 secured` at its center to a bracket 30 fixed Within the housing 2 and having its ends secured to the annular portion of the lever 5. It is to be understood that the member 25 may be of any cross-sectional shape and that it may, if desired, be made in helical or other 'form or in two or more parts. In the form shown one end of the ribbon is bolted to a stud 26 which is threaded into the lever 5 and the other end is secured to a plate 27 which is connected by means of machine screws 28 to the lever 5 and is provided with a pair of set screws 29 which bear against the lever.

By adjusting the machine screws the ribbon may be put under tensionY and by adjusting the set screws it may beso positioned that it neither causes any pressure to be exerted on the iulcrum bearings nor sustains any of the `Weight oi the lever. No end thrust is placed upon the ivots When the ribbon is under tension. n ,the contrary, all end thrust is prevented, so end thrust bearings may be dispense with. The grooves in the fulcrum bearings may, if desired, also be dispensed with, as the ribbon will eiectua-lly hold the lever in place. r

Since the center of mass of the lever is located on the axis of the-ulcrum pivots the lever would balance Ain any position.

The ribbon, however, always brings it to balance with the hand on zero, no matter it the scale be out of level. When the loads on the platters are equal, the resilient ribbon has no edect on the Weighing. Thus the Weighing is done by balancing Weight against Weight. When, however, thev load on one platter slightly exceeds that on the other, the over Weight is approximately offset by the resilient force of the ribbon 25 and 'the amount of over Weight is approximately indicated on the chart 19. The operator, therefore, lrnows approximately how much ot the commodity to add or remove to bringen the hand to zero is to be noted that absolutely no Weight is carried by 'the ribbon, Whether the scale he loaded or empty, and that the only strains to which the resilient member is subiected are torsional.

The scale is especially useful in filling mirages. Ir, 'for example, it is desired to -`all pound boxes ol candy, an empty box and one pound poise are placed upon the poise i an. Each box to be filled is then placed upon the commodity platter and enoughn lever, fulcrum pivots supporting said lever upon said frame, and resilient means in subl stantial alignment with the axis of said pivots connecting said lever and said frame.

2. In a scale, in combination, a frame, a lever ulcrumed thereon, a resilient member secured to said lever and said frame and adapted to be torsionally stressed when said lever is moved from zero position, and means acting axially of the fulcrum of said lever for putting said resilient member under tension.

3. In a scale, in combination, pivotally connected frame and lever members, nonsupporting resilient means connected at laterally spaced points to one of said members and intermediately connected to the other of said members.

Il. In a scale, in combination, frame and lever members pivots operatively connecting said'frame and lever members and resilient means tensioned between laterally spaced points on one of saidl members and intermediately connected to the other of said members 5. In a scale, in combination, pivotally connected frame and lever members, resilient means connected at laterally spaced points to one of said members in substantial alignment yvith the pivotal axis thereof and intermediately connected to the other of said members. y

6. In a-Weighing scale, in combination, a. frame, a lever pivoted thereon, a resilient member connected to said lever at laterall spaced points in substantial alignment Wit its pivotal axis and intermediately connected to said frame.

7. In a weighing scale` in combination, l

frame, a lever pivoted thereon, a resilient.

member tensioned between laterally spaced points on said lever in substantial alignment with its pivotal axis, said resilient member being intermediately connected to said frame.

8. In a weighing scale, in combination, s frame, a lever having aligned fulcrum pivots supported by said frame and an o ing betweensaid pivots, and n resiliggt lll memberV in said opening and connected to l said lever and frame at points in substan-rk points on said lever in substantial aligntial alignment with said pivot`s`. f A ment with said pivots and intermediately 9. In a weighing scale,l in combination, connected to said frame. avframe, a'levery having' aligned fulcrum CLARE'NCEH.HAPGOOD. 5 pivots supported by said frame and an Witnesses: 1

opening between said pivots, and a resilient C. E. Wmoox,

member in said opening tensioned between C. O. -MARSHALL 

